Land that time forgot: An expedition of scientists and journalists sets out for the Lost Island of Caprona to rescue the marooned Bowen Tyler. They discover prehistoric monsters and primitive, savage tribespeople. Taken prisoner, the members of the expedition are held captive in a city built entirely of human skulls on the rim of a volcano. The people that time forgot: A sequel to The land that time forgot, an Arctic expedition discovers a steamy tropical oasis complete with primitive peoples and dinosaurs.